Cross-weaving loom



Dec. 11, 1928.

H-. A. DAVIS cnoss WEAVING LOOM Filed April 4, 1928 2 Sheets-Sheet 1552... '4 is: Z.

t a swag.

Patented Dec. 11, 1928.

' I g i 1,695,010 PATENT OFFICE.

' HARRY A. DAVIS, on rtornnnnn, mnssncncsnrrs, rissrenon T0nnArEa'oonronA TION, or HOIEEDALE, MASSACHUSETTS, a eonronarron orMAINE.

CROSS-WEAVING LOOM.

Application filed April 4, 1928. Serial No 267,245.

This invention relates to leno or crossweaving looms in whlch certain ofthe warp threads are crossed relative to others to produce a cross ormarquisette weave.

In the patent to Alfred E. Stafford, No. 1,511,184, dated October T,1924, a loom of this general type is shown and described wherein thedoup thread is controlled by a doup heddle having two legs adaptedto beengaged by lifter heddles on each shed formation to move the doupthread. from the'closed shed plane to the upper plane of the shed oneach shed formation, and such action of the lifter heddles is controlledby suitable cam and treadle vmechanism at the lower part of the loom,whereby the lifter heddles are operated, first one and then the other,to raise the doup thread to the upper plane of the shed. Associated witheach of the doup heddles and its associated lifter heddles there isdescribed in this patent a jumper heddle for controlling the jumperthread, and means are provided to positively move the jumper heddle fromthe closed shed plane to the lower plane of the shed on each shedformation. This manner of controlling the heddles has provedto be.

effective and eficiennbuti since the jumper thread crosses over the doupthread at, each shed formation, the positive action of the jumper heddleis liable at times to putundue strain upon the jumper thread. M

In accordancewith the present invention, the jumper heddle is normallyunder the action of yielding means, such as a spring or springs, formoving the'jumper heddle and jumper thread to the lower plane of theshed on each shed formation, thereby obviating the undue strain thatfrequently occurs on the jumper thread or threads when the jumper heddleis moved to the lower shed plane.

When, however, the jumper thread is crossed over or above the doupthread and the umperhed dle is under the influence of the spring meansfor moving it to the lower plane of the shed, the doup thread isliableto retain the jumper heddle from its full down ward movement under thespring acting means, although permitting such movement suiiiciently forthe formation. of a proper shed. Underthese conditions, the flexibleconnection between the jumper heddle and its lit"- ing means is liableto becomeslaclgwith the result that the flexible connection will attimes fail to properly engage the guide over F which it passes, and,indeed, at times jump loom operation.

entirely from such guide and cause improper In a loom of the generaltype hereinbefore 7 threads in the same plane of the shed and the jumperthread in the opposite plane ofrthe shed on successive shed formations,and here-* after the action ofthe cross-weaving unit will be described,it being understood, of course, that any desired number of units may beemployed in the 'leno' or cross-weaving loom. 7 V One of the objects ofthe present invention 1s to obviate the objections incidentto slacknessin the flexible connection betweenthe jumper heddleand its transmitteror lifting means during the idle stroke of the latter, whenthe jumperthread is crossed over the doup thread and the jumper heddle is moved tothelower plane of the shed, and maintain such flexible connection taut,notwithstand-- ing the fact that the umper thread and consequently thejumper heddle may be prevented from full lowered position by the doupthread. a

The invention and newpfeatures thereof will best be made clear from thefollowing de- 7 one good form thereof.

In the drawings:

Fig. 1 is a perspective'view of a'leno or eross-weaving loomcontaining'the present lnventlon; t I s Fig. 2 is an enlarged frontelevation, with parts broken away, of the jumper heddle head motion; andW I Fig. 3 is an enlarged side elevation of. the

jumper heddle head motion with some of the parts shown in section. p Inaccordance with the present invention,

the lifter heddles which are. associated in pairs with the doup heddleare actuated posia. t vely by cam and treadle mechanism substantially asshown; and described in the Stafford patent above mentioned, andconsequently it is not hereindeemedinecessary to further de. scribe thisfeature, but the jumper heddle inv the presentinvention is moveddownwardly} by the yielding action'ofspring means a-ndlin this respectdiffers from theloo-m shown and described in the Stafiord patent. I Inthe Spoiford Patent, No. 1,439,029, dated heddle, and such parts as thusfar described may be substantially the same as indicated in the StaffordPatent, No. 1,511,184, herein before mentioned.

Extending upwardly from the loom frame is the loom arch 7, above whichprojects an arm 8 for the sup ort of the head motion. Mounted in a suitale bearing 9 of the arm 8 is a stud or shaft 10 on which mounted theactuator 11 which, as indicated in Fig. 1, is connected to the rod 5,whereby the actuator actuator 11 is given its rocking movement upon thestud or shaft 10.

The arm 11, as indicated in Fig. 3, has a sleeve portion 12 by which. itis mounted for rocking movement on the stud or shaft 10, and extendingfrom the actuator 11 is a projecting portion 13 which is adapted toengage and operate the head motion for the jumper heddle, as willpresently be described.

The head motion of the jumper heddle comprises a transmitter or rocker14 which may be appropriately mounted on the sleeve portion 12 of thearm 11 for rocking movement thereon. The transmitter 14 has a seg ment15 adjustably connected thereto by means of a pin 16 and slot 17,whereby the segment 15 may be properly adjusted upon the transmitter ofwhich it forms a part.

Extending from the transmitter 14 .is an arm 18 having a portion 19adapted to be engaged by the projecting portion 13 of the uring theactive stroke thereof, whereby the transmitter may be moved from thecrank shaft to lift the jumper heddle into the closed shed plane againstthe action of the jumper heddle depressing springs, as will "presentlyappear.

Secured to the segment 15 is a strap or flexible connection 20, aportion of which extends over the guide or pulley 21 mounted for turningmovement upon a stand 22 rising from the loom arch. The lower endportion 23 of the flexible connection 20 is secured to the jumper heddleframe 24 which is normally under the influence of springs 25 foreffecting lowering movement of the jumper heddle during the idle strokeof the head motion.

As indicated in Fig. 1, the jumper heddle frame 24 carries the jumperheddle 26 having an eye 27 through which passes the jumper thread a, thelower end portion of the jumper heddle 26 being secured to the lowerpart 28 of the 'umper heddle frame, which, as above statet, is under theinfluence of springs 25 for effecting lowering movement of the jumperheddle frame. It is to be understood, of course, that there may be anynumber of jumper heddles 26 for the control of any suitable number ofjumper threads, but only one is shown in Fig. 1 of the'drawings, sincethe others will be merely duplicates thereof.

As hereinbefore stated, a unit of the leno or cross weaving mechanismcomprises a jumper heddle and a doup heddle with which are associatedtwo lifter heddles. The doup heddle 29 has the usual eye portion 30through which passes a doup thread 7), and such doup heddle has the twoleg portions 31 and which are engaged by the associated pair of lifterheddles, substantially as more fully over suitable guide pulleys and areconnected at their upper portions to the oscillating pub ley 39. Wherethe loom contains a plural number of units constituted by a doup heddle,pair of lifter heddles and a jumper heddle, other straps of similarcharacter will be connected to such heddles and pass upwardly about aguide pulley on the loom arch and be secured at their upper ends tosuitable pulleys, such as 40, in a manner similar to the same characterof construction as indi cated and described in the Stafford patent. Thepulleys 39 and 40 are mounted upon the rocking arm 41 which may beappropriately supported by the shaft or stud 10, as indicated in Fig. 3,the construction forming a compensating device for the proper formationof the shed as described in the Stafford patent.

As hereinbefore stated, the head motion for the jumper heddle comprisesthe transmitter 14 and its associated segment 15, and during the activestroke of the actuator 11 the latter will engage the arm 18 ofthetransmitter in order to raise the jumper heddle into the closed shedplane. In the idle stroke of the actuator and transmitter it isdesirable to maintain the flexible connection between the transmitterand jumper heddle in a taut condition in order that the flexibleconnection. may not become disenfor arresting the idle stroke of thetrans mitter during the downward movement of the jumper heddle inresponse to its lower- 7 held in adjusted position by a lock nut 44, and

such stop is adapted to engage and be arrested by a fixed part of theloom during the downward movement of the jumper heddle, there bymaintaining the flexible connectionb tween the transmitter and jumperheddle taut, notwithstanding the fact that the doup thread over whichthe'jumper thread passes may prevent full lowering movement of thejumper heddle responsive to its lowering spring. In the present instanceof the invention the stop 43 is adapted to engage the edge portion 45 ofthe upwardly extending arm 8, as indicated in Fig. 1.

From the construction described it will be apparent that when theactuator ll ismoving in its active stroke to raise the jumper heddle, itwill engage the transmitter 14 and lift the jumper heddle to placethe'jumper thread in the closed shed plane, and on its idle or inactivestroke the actuator 11 will become disengaged from the transmitter 14 topermit the stop 43 to arrest movement of the transmitter in its idlestroke, with the result that the flexible connection between thetransmitter and jumper heddle will be maintained in taut conditionnotwithstanding that the doup thread may prevent full lowering movementof the umper heddle under the action of its lowering spring.

During the Weaving operation one of thelitter heddles will raise thedoup heddle and consequently the doup thread controlled thereby from theclosed to the upper plane of the shed, and substantially simultaneouslytherewith the jumper heddle will move the jumper thread, now crossedover the doup thread, into the lower plane of the shed,

and although the jumper heddle may not be fully depressed by itsactuating springs and be held slightly raised by the sustaining actionof the doup thread, the stop on the transmitter will arrest the idlemovement of the transmitter to maintain the flexible connection betweenit and the. jumper heddle taut and without slackness.

The stop 43, as will be noted, is adjustable, and may be manipulated toarrest the transmitter during the lowering movement of the jumper heddleata point in'the downward movement of the latter, such that the flexibleconnection between the transmitter and the jumper heddle may always bemaintained in taut condition. V

What is claimed is: 1. In a leno or cross-weaving loom, the combinationof doup heddles and-lifter heddles therefor, a jumper heddle, yieldingarm 18, in the present inmeans normally acting to depress the jumperheddle, a head motion for the umper heddle, a flexible connectionbetween the head motion and jumper heddle, and a stop for the jumperhead motion acting to maintain the flexible connection taut when thejumper heddle is held raised by the crossed doup and jumper threads. j 1

2. In a leno or cross-weaving loom, the

combination of doup heddles and'lifter heddles therefor, a jumperheddle, spring means normally acting to lower the umper heddle,

a head motion for raising thejumper hed-f die, a'flexi-ble connectlonbetween the umper heddle and head motion, and a stop for lim iting theidle stroke of the headmotionto maintain'the flexible connection tautwhen the umper heddle is lowered by its normally. acting spring loweringmeans.

3. In a leno or cross-weaving loom, the. combination or a doup heddle,two llft-Glf heddles for operating-it, a jumperheddle, a

spring normally acting to lower the jumper heddle into the lower shedplane when the jumper thread is crossed over the doup thread, atransmitter for lifting the jumper heddle, a flexible connection betweenthe transmitter and umper heddle, a guide for the flexible connectionbetween the trans-J mitter and jumper heddle, and a stop for limitingthe movement of the transmitter as the jumper heddle is lowered by itsspring and the threads are crossed that the flexible connection may bemaintained taut.

\ 4. In a leno or cross-weaving loom, the combination of a doup heddle,two lifter heddles for raising the doup thread into the upper shed planeon each shed formation, a

jumper heddle, a spring normally acting to lower the jumper heddle whenthe jumper thread is crossed over the doup thread, a

rocking transmitter for raising the jumper heddle, a flexible connectionbetween the transmitter and jumper heddle, and means for limiting themovemcntof the. transmitter as the jumper heddle is lowered by its:spring to maintain the flexible connection taut between the transmitterand jumper heddle.

5. In a leno or cross-weavlng loom, the combination of a doup heddle andtwo lifter heddles, a jumper heddle, a spring normally.

acting to lower the jumper heddle, a trans mitt-er for raising thejumper heddle, a flexible connection between the transmitter and jumperheddle-an actuator for the transmitter, and a stop for limiting the idlestroke of the transmitter when the jumper heddlefis lowered by itsspring and the jumper thread is crossed over the doup thread that theflexible connec-tion may be maintained taut as the jumper heddle islowered;

6. In a leno or cross-weaving loom, the

comb-nation of? a doup heddle and two lifter heddles, a jumper heddle, aspring normally acting to lower the jumper heddle, a transering thejumper heddle, a. rocking trans-v mitter for raising the jumper heddle,a flexible connection'between the transmitter and jumper heddle, an armprojecting from the transmitter, an actuator for engaging said arm toraise the jumper heddle, and a stop for limiting the idle movement ofthe transmitter to maintain the flexible connection taut as the jumperheddle is lowered by its spring and the jumper thread is crossed overthe doup thread.

8. In a lono or cross-weaving loom having a doup heddle, lifter heddles,a jumper heddle, and a spring for lowering the jumper heddle, thecombination of a transmitter for raising the jumper heddle, a flexibleconnection between the transmitter and jumper heddle, a guide for theflexible connection, an actuator for engaging the transmitter to liftthe jumper heddle, and a stop for engaging a part on the loom frame forlimiting the movement of the transmitter responsive to the jumper heddlespring to maintain the flexible connection from becoming slack as thejumper heddle is lowered by its spring and the jumper thread is crossedabove the doup thread.

In testimony whereof, I have signed my name to this specification.

HARRY A. DAVIS.

